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Describe sparseify here.

ext2/ext3

fat12/fat16/fat32

ntfs

  • $Bitmap contains a bitmap covering the entire block device, including metadata and special files.
  • $MFT contains block size, for computing bitmap offsets. This is usually 4096, for compatibility with stream compression, but it can be different.
  • ntfsprogs (http://www.linux-ntfs.org) comes in handy: ntfsinfo --mft <dev> for block size, ntfscat <dev> \$Bitmap for bitmap
  • This has to be the easiest of all, ironically.

ffs/ufs/ufs2